Tinius Olsen launches new video extensometer range

A video extensometer is a device that is capable of performing stress/strain measurements of certain materials, by capturing continuous images of the specimen during test, using a frame grabber or a digital video camera attached to a PC.

Just a month ago, Tinius Olsen launched its new range of video extensometers leveraging the power of the latest technology available in the market. Click here to learn more.

True to Tinius Olsen’s mantra as a world leader in the supply of materials testing systems, the Tinius Olsen video extensometer leaps ahead of competitive offerings from Germany, France and the US with the latest technology, ease of use and offers the following benefits;

• The sub-micron resolution (certified to ISO 19513 Class 0.5 and ASTM E83 Class B1 for metals testing) of these extensometers offers the user the same functionality of contact type extensometers with the added benefits of video extensometry.
• The high-tech testing software enables the user to measure strain on low and high elongation raw material test specimens or components using the same extensometer which translates in to additional savings and higher productivity in the lab.
• The user can select a wide range of gauge lengths from as little as 1mm upto 800 mm. This enables the user to cover a variety of international test methods that specify different gauge lengths, and which would not be possible in contact type extensometers.
• The extensometer can be used with a temperature chambers and or liquid baths to test a variety of applications.
• Tinius Olsen can supply the extensometer to fit and work with non Tinius Olsen systems e.g. Instron, Zwick, Shimandzu.
• The video strain data can be re run post test with new gauge marks on the same specimen
• Busy labs with multiple materials testing machines can use a single Tinius Olsen video extensometer across multiple tensile testing machines.

 

Frequently asked Questions:

• Does the Tinius Olsen video extensometer need sophisticated lighting ? 
• No, our latest technology compensates for lighting conditions in average labs
• Does it require exacting specimen marking ?
• No, the software supplied with the extensometer does all the work in identifying the changing patterns on image of the sample thereby giving highly accurate strain data.
• Is the video extensometer available at a price QA\QC labs testing metals, plastics, composites, elastomers and more can afford in these tough economic times?
• Yes, our pricing is very modular and competitive allowing the user to pick and choose a system that is exactly suited to their technical and commercial needs.
• How long does it take to set the extensometer up ?
• Tinius Olsen sales team can walk into your lab and set the unit up on any tensile testing machine and demonstrate in 30 minutes. Once set up, each test is just 4 mouse clicks. It literally takes seconds to starting using our user-friendly technology.

 For information please contact -

Amit Mitbawkar
Team Leader - Industrial Materials Testing
SIGMA ENTERPRISES LLC
Engineering Products Division
PO Box - 96241,
Dubai, UAE
Tel - +971 4 8851828
Fax - +971 4 8851628
Mobile - +971 50 4450907
Email – amit_mitbawkar@sep.ae
Website - www.sigma-epd.com

Modulus of Elasticity

Modulus of elasticity. Rate of change of strain as a function of stress. The slope of the straight line portion of a stress-strain diagram. Tangent modulus of elasticity is the slope of the stress-strain diagram at any point. Secant modulus of elasticity is stress divided by strain at any given value of stress or strain. It also is called stress strain ratio. Tangent and secant modulus of elasticity are equal up to the proportional limit of a material.

Depending on the type of loading represented by the stress-strain diagram, modulus of elasticity may be reported as compressive modulus of elasticity (or modulus of elasticity in compression), flexural modulus of elasticity (or modulus of elasticity in flexure), shear modulus of elasticity (or modulus of elasticity in shear), tensile modulus of elasticity (or modulus of elasticity in tension) or torsional modulus of elasticity (or modulus of elasticity in torsion). Modulus of elasticity may be determined by dynamic mechanical testing where it can be derived from complex modulus.

Modulus used alone generally refers to tensile modulus of elasticity. Shear modulus is almost always equal to torsional modulus and both are called modulus of rigidity. Moduli of elasticity in tension and compression are approximately equal and are known as Young's modulus. Modulus of rigidity is related to Young's modulus by the equation: E = 2G (1 + r) where E is Young's modulus (psi), G is modulus of rigidity (psi) and r is Poisson's ratio. Modulus of elasticity also is called elastic modulus and coefficient of elasticity.

 The elastic modulus of an object is defined as the slope of its stress-strain curve in the elastic deformation region:

where λ (lambda) is the elastic modulus; stress is the force causing the deformation divided by the area to which the force is applied; and strain is the ratio of the change caused by the stress to the original state of the object. If stress is measured in pascals, since strain is a unitless ratio, then the units of λ are pascals as well. An alternative definition is that the elastic modulus is the stress required to cause a sample of the material to double in length. This is not realistic for most materials because the value is far greater than the yield stress of the material or the point where elongation becomes nonlinear, but some may find this definition more intuitive.
Specifying how stress and strain are to be measured, including directions, allows for many types of elastic moduli to be defined. The three primary ones are:

• Young's modulus (E) describes tensile elasticity, or the tendency of an object to deform along an axis when opposing forces are applied along that axis; it is defined as the ratio of tensile stress to tensile strain. It is often referred to simply as the elastic modulus.
• The shear modulus or modulus of rigidity (G or ) describes an object's tendency to shear (the deformation of shape at constant volume) when acted upon by opposing forces; it is defined as shear stress over shear strain. The shear modulus is part of the derivation of viscosity.
• The bulk modulus (K) describes volumetric elasticity, or the tendency of an object to deform in all directions when uniformly loaded in all directions; it is defined as volumetric stress over volumetric strain, and is the inverse of compressibility. The bulk modulus is an extension of Young's modulus to three dimensions.

References -

Tinius Olsen Knowledge Centre - http://tiniusolsen.com/resource-center/mechanical-properties-m.html

Wikipedia - http://en.wikipedia.org/wiki/Elastic_modulus

For information please contact -

Amit Mitbawkar
Team Leader - Industrial Materials Testing
SIGMA ENTERPRISES LLC
Engineering Products Division
PO Box - 96241,
Dubai, UAE
Tel - +971 4 8851828
Fax - +971 4 8851628
Mobile - +971 50 4450907
Email – amit_mitbawkar@sep.ae
Website - www.sigma-epd.com